prologue:the end is just the beginning

"15 minutes to dawn!! 15 minutes to dawn left!!!"

The raven's altered words produced a great feeling of joy among the remaining demon slayer, who rose against wounds and exhaustion, with only the strength of will, forged from years of training to death, years of forging combat styles designed to kill their enemies, years of fighting horrors beyond most people's imagination. No matter the pain and suffering of their bodies, they had a mission, an oath they made to that fallen leader who cared for them and inspired them to fight against this primal evil, they had a desire for revenge against their fallen relatives, friends,lovers and comrades, they had a duty as swordsmen that they had, no... they wanted to finally fulfill.

Kagaya Ubuyashiki's plan had suffered an unexpected change, when all the Demon Slayers were transported directly to the Infinite Castle, Muzan's base of operations, in an attempt to finally end the resistance that hindered his plans to obtain his long-awaited immunity to the sun. Unfortunately for the Demon King, the Demon Slayers were stronger than he thought, ending with all of his upper moons and most powerful demons thanks to the strong attacks and sieges, coordinated by the crows and talismans created by Yushiro, a demon created by Tamayo and his most loyal assistant, in addition to the fact that Muzan himself was severely poisoned by Tamayo herself, that traitor demon who swore revenge more than 400 years ago. But not everything was smiles for the Demon Slayers, in their mission they had lost countless lives whose bodies and human remains were completely destroyed when the infinite fortress was collapsed by killing Nakime, the upper moon 4, highlighting the lives of Lady Tamayo, Genya Shinazugawa, Muichiro Tokito,the mist Hashira,and Shinobu Kocho,the insect Hashira.

Entire centuries of triumphs and defeats, of rescues and losses, of struggle and sacrifice. Entire centuries led them to this moment. It was now or never and that was why they were not going to rest until he gave his last breath during the dawn.They would offer their lives as a sacrifice if necessary, some would do it gladly to save their companions or for having lost more than their hearts can bear.

Now the situation was at a stalemate. On one hand, Muzan Kibutsuji was terribly weakened by the enormous amount of attacks he received from the crimson swords, barely unable to move and with great difficulty generating himself. To top it off, the poison continued to take effect and prevented his body from exploding so that at least one cell of his body could escape to survive. The demon slayers were not in good condition either. Most of surviving Hashiras, along with the strongest swordsmen of the corps had reached the limits of their strength and were barely able to stand, but the crow's message allowed them all to revive their spirits to continue the battle until dawn,

"U-uggg, I can barely lift my arms" Muzan Kibutsuji, the father and creator of the demons, watched with pure hatred as the user of the lightning,Zenitsu Agatsuma, and beast breathing user,Inosuke Hashibira, were getting up with great difficulty,ready to continue the battle"stupid demon slayers!! Aggg!!" One of his legs began to fail, making him fall to his knees" They are just damn pests, no matter how much I crush them, they always keep getting up because they can't die at once!!??"

The 2 swordsmen took advantage of their opponent's distraction to charge their most powerful attacks, unfortunately, both demon slayers didn't have the crimson sword activated, so their attacks produced nothing more than some cuts,that they were able to regenerate quickly, despite the effect of the poison, still present in the demon's body. Muzan took advantage of this to knock Zenitsu away with a blow, who could barely move due to the pain in his muscles, a product of the electricity. Inosuke continued attacking with several of his forms, in order to weaken his opponent, but a shock wave pushed him away from Muzan leaving him defenseless to an attack, something he would not waste to finish off the mountain king.

"SUN BREATHING: BURNING BONES, SUMMER SUN!!". Tanjirou Kamado,the newly appointed sun Hashira, stood between the two combatants, managing to save his friend by cutting off the Demon King's tentacles and thanks to the crimson sword and the divine properties of his breathing technique, he managed to land several critical hits that made it difficult for Kibutsuji to regenerate.

But a small wound, which opened during the execution of one of the forms, abruptly stopped the wave of attacks. Cursing, he tried to get back into combat position but it was too late. 2 sharp tentacles headed towards him at full speed, but Inosuke and Zenitsu's quick reflexes cut off Muzan's limbs before they reached Tanjiro.

"Gompanchiro!!Let's us our techniques to attack him!!"Inosuke suggested, seeing that Muzan was temporarily paralyzed by the pain and the poison.

"He's right, your breathing can open an opening in his defense to damage him,and our attacks may be more useful against one of Muzan's hearts or brains than against his body."Zenitsu added in one of those rare moments where they both seemed to agree.

Tanjirou nodded at the idea, preparing his Nichirin to carry out a direct attack followed by Zenitsu and Inosuke, they waited for the right moment. Muzan perceived the movement of the 3 teenagers and quickly used more of his tentacles to stop the siege attempt, but Tanjirou was able to dodge them in time, while Zenitsu and Inosuke cut off the appendages "Sun Breathing: Second Form, Clear Blue Sky" The 3 circular cuts hit the chest and abdomen of the demon, exposing its vital organs. "Now!!"

"Thunder Breathing: Seventh Form,Flaming Thunder god!!"

"BEAST BREATHING: EIGHTH FANG, EXPLOSIVE RUSH!!"

Inosuke's powerful thrust violently ripped out one of the hearts while Zenitsu's powerful slash pulverized one of the brains, causing immense pain to the demon. At that point, Muzan knew that he could not regenerate his organs, due to aging and Tamayo's poison, so his only available option was to flee at any cost, especially with dawn so close to them.

In a desperate attempt, he threw his meat whips in the direction of the 3 swordsmen to finish them off. Both Zenitsu and Inosuke got up to dodge the attacks, but seeing Tanjiro on his knees, desperately trying to get up as well,so the blond and the boar head opted to get in front of their friend, blocking the blows as much as they could.

"Guys, get out quickly, you won't be able to hold out much longer," Tanjirou pleaded as he saw all of his friends' wounds begin to bleed again from the movement of their bodies.

"W-we are expendable, we are unable to do anything to him on our own, but you are one of the few who can seriously harm Muzan, without the Hashiras, we cannot afford to lose you" Zenitsu argued with difficulty, trying to keep up with the rhythm of the cuts

"agg he's right, Gompanchiro you are the strongest of us all, we need you more than ever"

Seeing that nothing he did would convince them to leave him alone, Tanjirou took a deep breath and gritted his teeth hard as he tried to regain strength to get up. Unfortunately it was too late to prevent 2 of Muzan's tentacles from digging into his 2 friends, throwing them hard against the remains of the nearby buildings.

"NO!!!" Tanjirou saw in horror thanks to the transparent world,how Inosuke's ribs and lungs were pierced in the attack, causing one of them to explode, while Zenitsu's stomach was almost completely torn apart, barely having enough tissue to hold the organ together,while both crashed brutally against the surrounding walls and ruins"SUN HALO DRAGON HEAD DANCE!! FAKE RAINBOW!! SUNFLOWER THRUST!!!" Tanjirou's growing rage allowed him to recover enough to launch a wave of slashes and attacks, damaging and destroying the body of the weakened demon king, managing to trap him between his sword and a half-destroyed wall, but leaving him defenseless against any attack from Muzan.

"1 minute left until dawn!! There is 1 minute left until dawn!!"

"Damn it!! WHY CANT YOU DIE AT ONCE??!!"In an attempt to free himself and taking advantage of his opponent's vulnerable state, Muzan used the claws and blades on his arms to tear the Sun Breathing user to pieces in one blow and free himself from the Nichirin stuck in his chest.

"WIND BREATHING:FIRST FORM, DUST WHIRLWIND CUTTER!!"

"love breathing:second form,love pangs!!"

The powerful cyclone caused by Sanemi Shinazugawa, the Hashira of Wind, tore off and cut off a large part of Muzan's right side, while the long aerial slash of Mitsuri Kanroji, the Hashira of Love, easily destroyed the remaining tentacles from any angle of attack. Unfortunately for him, the demon's regeneration was still effective enough to repair the damage in a few seconds, resuming his attack against the redhead.

"WE WILL NOT ALLOW YOU TO LIVE ANYMORE,YOU FUCKING BASTARD!!NOT AFTER LOSING GENYA!!"Sanemi exclaimed with a fury as great as that felt by the Kamado.

"Tanjirou!! You can do it!!you can resist!!"Mitsuri encouraged him with all his strength, seeing the deplorable state of his best friend.

The pink-haired girl tore off Muzan's left arm with her brutal force, while the white-haired man cut off the right one, but unexpectedly, both arms automatically attacked the pillars, cutting off the arm and tearing the left side of Mitsuri's torso, while several of Sanemi's chest bones were brutally torn out, followed by a shockwave that violently pushed the 2 attackers. Tanjirou helplessly watched as his companions were massacred while he continued with all his strength to keep the sword on Muzan's chest while trying to reactivate the crimson sword of his Nichirin.

"KANROJI!!"A voice exclaimed in a clear horrified tone.

"SHINAZUGAWA!!"said another voice with concern.

"QUICKLY!! GO AND TEND THE WOUNDED!!" ordered a third voice while the accelerated footsteps of several people could be heard in the distance.

"THE DAWN HAS COME!! THE DAWN HAS COME!!STOP KIBUTSUJI AT ALL COSTS!!"

"WATER BREATING:SEVENTH FORM,DROP RIPPLE THRUST!!"The water screen of Giyuu Tomioka,the Water Hashira allowed him to block the several bone splinters that were thrown out"WE ALREADY GOT IT, TANJIROU!! KEEP HIM TRAPPED!!"He encouraged his friend to continue, unfortunately his left forearm was accidentally cut off by one of the bone harpoons, causing the black-haired man to moan in pain.

"NOOO!!!! I WON'T TO DIE HERE!!" With his last strength, Muzan transforms his head into a pair of giant jaws ready to devour Tanjirou.

"Serpent breathing:third form,coli choke!!"Obanai Iguro, the serpent hashira tore a large part of the huge mouth with great ferocity for daring to hurt his beloved pink-haired girl, standing between both opponents while continuing his attack from the front to prevent regeneration. Muzan took advantage of the proximity to attack the pillar, scratching his face again and breaking Yushiro's seal, which allowed him to see "Tomioka, go help Kamado with his Nichirin!! Kamado,I'm sorry, but now it all depends on you." In his desperate act to protect his partner, he launched himself directly against the huge mouth of the demon,shattering his entire skull and neck and chest bones, though the small spaces between the swordsman's flesh were spacious enough for Kaburamaru, Obanai's snake, to escape unharmed from the attack and retreat into his master's chest, seeing that he could do nothing to help. Muzan attempted to devour his body, but the constant attacks of his prey's crimson Nichirin sword forced him to throw it against the rubble, near of the body of the love Hashira.

Once free, he tries to repeat the attack but a metal ball from Gyomei Himejima, the stone pillar, destroyed Muzan's head, while Tomioka,helps his apprentice by wrapping his only functional hand around the hilt of the redhead's sword and together they activate the crimson sword again,causing internal burns in Muzan that increased the speed of the burns produced by sunlight.

"Stone breathing:fourth form,volcanic rick,rapid conquest!!"the axe and flail of Gyiomei cut off both one of Muzan's arms and the lower half, preventing him from regenerating quickly with the crimson sword and stopping his wave of attacks against Tanjirou, who maintained his grip tightly, with the help of Tomioka.

"Iguro and Kanroji have fallen in combat!!" one of the Kakushis informed the 3 remaining pillars, leaving them briefly in shock before resuming their efforts with even more growing anger and determination.

"Then it is likely that Shinazugawa has also fallen...We are the only ones left!! Tomioka, you must protect Kamado at all costs!! Kamado!! No matter what happens, don't stop holding Muzan!! I'll take care of any attack that comes" ordered Gyiomei while mutilating all the whips and limbs that were regenerating.

"Keep going Tanjirou!! We almost have it!! The sun is already here!!" Giyuu informed to encourage Tanjirou.

"AAAAAHHHH NO, NO THIS CAN'T END LIKE THIS!!!"Muzan's body began to mutate and deform into a giant mass of flesh, which was absorbing the red-haired swordsman. Tomioka desperately tried to separate him while Gyomei lunged to attack the giant mass, but several tentacles and thorns stuck into the Hashira's abdomen, throwing him to the ground.

"NO!!GIYUU!!!" Tanjirou shouted in desperation and tears in his eyes, undecided between wanting to save his friend and spiritual older brother and the duty to follow Gyiomei 's order.

The leader of the Hashiras attempted to use his weapons to push the mass of flesh away from the younger boy, leaving him exposed to a deep cut on his chest, crashing Gyiomei into one of the surrounding walls.

Tomioka just smiled weakly as blood came out of his mouth "Tanjirou, don't worry about me!!Whatever happens, don't separate your nichirin from Muzan!!!I will take care of protecting you two!!"

Another pair of tentacles tried to impale Tanjirou, but Tomioka used his body as a shield, receiving the thorns, which tore his back and threw them against one of the vehicles on the street. Tanjirou could only watch with anger, helplessness and sadness as all his friends and companions were brutally sacrificed to protect him, while he maintained the grip of his sword on Muzan's body. The walls of flesh took the body of the user of the sun breathing and slowly absorbed it.Tanjirou fought with all his strength to keep his mind awake while the darkness was claiming his vision.

"TANJIROU!!!"

The last thing he saw before being absorbed was how Kanao Tsuyuri, the tsuguko of the deceased Insect Pillar, was cut in half by one of the remaining tentacles as he desperately tried to run to save him.

Tanjirou woke up in a completely dark and unknown place, confused about where he was, how much time had passed and why he was in a dark place, but the memories of the battle came to his mind like a bucket of cold water, rekindling his enormous fury and sadness for the losses. He quickly got up and activated the flamea of his breathing to illuminate the place, revealing a cave made of flesh and tissue that completely stank of demon. Without wasting time, he began to perform all the forms of the sun breathing, mercilessly cutting and tearing apart everything that, according to his thoughts, was the inside of Muzan's body.

He advanced without a specific direction, letting the crimson flames and the sunlight do the rest of the work, concentrating on causing as much damage as possible in order to definitively kill the person responsible for all the pain caused to him and so many innocent lives over several centuries. However, a particular and strange smell for the Kamado stopped his siege, completely calling his attention. Without hesitation, he decided to advance through the different tissues and organs to find out the origin of the unknown stimulus, finding himself face to face with Kibutsuji on the other side of what seemed to be the rib cage, judging by the size and the white rib-shaped structures that adorned the ceiling.

Unlike the imposing image that the demon king used to show in his best days in front of anyone who was in his presence, Muzan was now nothing more than an extremely sick man, with an extremely skeletal appearance, with barely a few white locks adorning his noticeably disfigured head and lacking some muscles. Several black spots and burn marks numb his wrinkled and dry skin. He barely seemed to have the energy to skin himself, gasping in pain from the clear open wounds that could no longer be regenerated and without his 2 arms, which were replaced by several tentacles much thinner than the previous ones, beneath him there was a curious circle of blood with many unknown symbols that emitted several whispers incomprehensible to the redhead.

Tanjirou's nose flared at the bubbling hatred building up throughout his body and he quickly set out to run at top speed against the demon, who, terrified, quickly used the room made of his own flesh to create walls and structures to try to slow down his arrival as much as possible. "Shuten-dōji !! Ancient master and lord of the demons !! My time to burn has come !!!"

"MUZAN KIBUTSUJI!!!"Tanjirou shouted as he quickly destroyed and cut each and every wall and wall of flesh that appeared in front of him, trying to reach the other side of the room as quickly as possible, luckily, the last remains began to become weaker and with clear burn marks, which allowed them to advance more easily.

When the solo hashira was finally in front of him, the demon was greatly terrified to see the look of death and absolute hatred of his opponent, to the point of, for the first time, fearing him just like the previous and first sun pillar . In panic, he used the meat whips to prevent Tanjirou from entering the circle of blood he had created, but the swordsman managed to cut and dodge several of them, when he was just a meter away from him Muzan tried to make a horizontal cut that the redhead dodged without problems and dived to cut off the last brain and heart that he had intact. The demon, desperate to stop the attack at any cost, used the remaining whips to wrap them around the Nichirin enveloped in crimson flames and with his last strength tried to push the sword out of his body while continuing with difficulty his mysterious chant."But I invoke the ancient power that one day I will return !! Reborn from the dead !!! To walk the earth again !!"

Tanjirou kicked Muzan's knees with his legs, forcing him to kneel, to use his body to put more pressure on his sword and sink the weapon deep into the demon's body "YOU TOOK EVERYTHING FROM ME!! YOU KILLED MY FAMILY!!! YOU KILLED MY FRIENDS!! YOU KILLED GOOD PEOPLE WHO COULD IMPROVE AND HELP THE WORLD!! YOU KILLED THE PERSON I LOVED!! I'M NOT LETTING YOU GET AWAY THIS TIME!!! I PLAN ON TAKING YOU TO HELL EVEN IF I HAVE TO BURN WITH YOU FOR ALL ETERNITY!!" He shouted with anger and a venom in his voices, causing a shiver in the man. The solar flames responded to the pain of their user and increased the intensity of the fire, burning with as much fury and anger as a red sun, while the mark burned with an intensity never seen before, producing a small crimson light and causing severe bleeding in the head.

To say that Muzan was terrified would be an understatement, he had never seen so much hatred and determination in a human.Not even Yoriichi had provoked such a sensation in him. He barely had enough resistance to stop the Nichirin, so he used one of his tentacles to stab the Hahira's abdomen to kill him or stop him, provoking a loud cry of pain, fury and determination from the redhead, but instead of retreating, he increased the force of the thrust, causing the sword to stab faster, provoking another equally loud scream. Muzan could only try to slow the Nichirin's advance as much as possible to try to complete his last plan.Unfortunately for him, one of the brains was pierced and incinerated by the flames of the Kamado, which burned with joy at the longed-for reward, causing a loud cry of pain in the demon king.

In an act of fortune for Muzan, the circle began to create a faint purple glow, while the symbols and runes written on the ground began to peel off and float near the spot, indicating that the ritual seemed to be about to be activated, rekindling some strength in the demon to continue."I INVOKE THE ANCIENT POWER TO END MY ENEMIES !! TO REVIVE AND DEFEAT DEATH !!"

Tanjiro's Nichirin had already touched Muzan's heart when the purple light enveloped both, causing a small shockwave that separated Tanjiro from Muzan, while listening to the screams of pain of the demon king. The redhead could see nothing but a blinding purple light, however, he could still perceive Muzan's scent, which he noticed was slowly fading away, as if he were moving away.

"NO!! I WON'T LET YOU ESCAPE!!I WON'T LET THEIR SACRIFICES BE IN VAIN!!"He said furiously as he quickly rose up, engulfing his own body in the raging crimson flames"SUN BREATHING:THIRTEENTH FORM!!"with only his sense of smell to guide him, Tanjirou pounced on Muzan's scent until he sensed him close enough to deliver a succession of cuts and stabs that hit their target and elicited indescribable screams of pain, much to the satisfaction of the Hanafuda earring swordsman.

When the attack ended, he barely had any energy left in his body to slow down his own speed, causing the redhead to fall heavily against the ground. His vision was completely blurred, his sense of smell was not working, his body no longer responded to any attempt at movement, although he did not feel pain either, in fact, he felt nothing, not even the cold sensation that people usually say happens when someone is close to dying or that feeling of seeing your entire life before your eyes.

The only thing he could perceive was his mark, which was completely off and his total concentration breathing, which seemed to be about to break. In his last moments of lucidity, Tanjirou wondered if he was going to be one more name on the long list of victims of the Battle of the Infinite Castle or if this was what people felt when they die, although to be honest, he did not care at all if this was going to be his last moments of life, after all he had fulfilled his mission.

Nezuko was cured of the demonic blood to become human again and Muzan Kibutsuji was finally dead, ending the threat of the demons at last.Although it made him sad to leave his sister alone and not even having had the luck to say goodbye properly, he knew that Aoi and the triplets would do everything possible to make her happy and take good care of her, and if Zenitsu, Inosuke or any of the Hashiras also survived, he knew that they would help her with her pain and she could even form a beautiful family with one of them, although he suspected that Zenitsu would be the one to take advantage of the opportunity. It's not that he was opposed to it, on the contrary, he would happily give them his blessing from heaven and if that wasn't the case, he would also accept the rest of the demon slayers, even Sanemi, who earned his complete respect for the dedication he had in battle...

...But he was another story. Tanjirou Kamado had lived a happy and full life, only to have it all unfairly taken away from him by a horrible monster, he worked with blood, sweat and tears to become stronger and protect the only family he had left, he fought every day and night for his survival, destroying his body in the process with numerous quite painful injuries and with the uncertainty of whether the next day would be the last of his life, he saw innocent people die in horrible and grotesque ways, he witnessed firsthand the deaths of people he cared about and who inspired him greatly like Kyojurou Rengoku, although he kept his heart ablaze until the last of his days as the flame Hashira taught him, he met the love of his life and had the enormous fortune of being completely reciprocated, only for her to die in the final battle while enduring the pain of mourning for months, due to a confession she told him that would inevitably lead to this, despite the fact that he trained and improved tirelessly in order to avoid the painful outcome and finally,he saw all of his friends being slaughtered by the same monster that caused all the pain in his life.

He wished greatly for them to survive, they were the best people he had ever met and they certainly deserved a long happy life, enjoying the fruits of their hard work, but the Kamado was mentally and emotionally exhausted and broken.He did not regret his decision to become a demon slayer and fight for the sake of his only family and the innocent people but right now, he wish to finally put down his weapon to never use it in combat again and rest in peace either in life with his dear sister or in death with his beloved.

"If I die, at least we can be together again, my sweet butterfly" he thought with a small tired smile as he slowly closed his eyes, letting fate decide his future.

Seconds later, several police patrols came across a scene straight out of a horror movie. The body of an adult man with a muscular build and pink skin was torn apart and scattered all over the street, highlighting the victim's head, who was frozen in a grimace of horror and absolute pain.

The officers were doing everything they could not to vomit while they moved all the civilians away from the place and helped 2 people they saw firsthand. The blonde woman in the white and red suit could only stand still horrified, unable to process what she had seen, before suddenly fainting.

Her companion, a strong red-haired man with orange flames all over his body, could only watch the scene in shock. Not because of the tragic fate of the victim, a criminal wanted for violent homicide and armed robbery. He couldn't care less if the bastard was slaughtered slowly and painfully, no, it was the skills of the person responsible for the scene, which left him extremely surprised, who turned out to be a red-haired teenager, from what little he could see between the spaces of the doctors who attended to him.

He could barely see the boy's movements, even without the purple flash that seemed to have produced this whole accident, he seriously doubted that he would have perceived the speed of his attacks. If he knew that the teenager was responsible, it was thanks to the beautiful crimson flames of the young man's sword, which enveloped the villain before being torn apart. Analyzing the cuts he could also notice an incredible cleanliness and precision in them, not only were they perfect cuts, but they were all completely lethal and were aimed at vital areas that could kill their target if at least one of them hit, in addition to taking into account the fire that seemed to happily devour and incinerate the organic remains.

Captivated, he approached the villain's corpse and brought his hand closer to the crimson flames. First he tried to touch it but when he brought his hand closer, a strong pain covered his palm and burned his glove, revealing a strong burn all over his hand. With his other hand, he summoned some orange flames that he brought closer to the crimson flames, but before coming into contact, the orange flames went out, or rather, they were extinguished by the crimson flames, which tried to pounce on them.The man was able to pull his hand away in time, but that did not prevent another painful burn that made him grunt in pain.

He changed his attention to the person responsible for this.He was a seriously injured 15 or 16 year old boy, who was being treated with some care by the doctors, since the Katana that was in his hand was still enveloped in the same crimson flames, but they were slowly dying out,near of his owner,but they don't burn him.

"That meant those flames were created by the boy"

He didn't know him at all, and he had already made a better impression than the vast majority of people he had ever met, including his own family. The boy was strong in his own right, his physical abilities, at first glance, would put most of the top heroes to shame. And if that wasn't enough, he possessed an impressive skill with fire…if that could be called that. Those flames were far above from his most powerful flares and he was sure that his son's wouldn't be a match for him either. It was like touching the sun itself, with all the warmth and pain that meant.

Endeavour would be lying if he said he wasn't jealous of him.

Accuracy could be trained to a certain extent but the speed, both in movement and attack, that the boy showed must definitely be the product of a speed quirk and together with the notorious "fire" quirk indicated that there were at least 2 quirks available. However, there were a couple of things that made him suspect a third, starting with the boy's wounds. They were definitely quite deep wounds, some of them even lethal, but he didn't seem to be bleeding, and he even partially retained his usual skin color. Under normal conditions those wounds should have already killed any adult, but he was still alive, so it could indicate the presence of a regeneration or resistance quirk.

"As if the fire quirk didn't make him powerful enough to be more than a headache for the unfortunate person who faces the boy" the hero thought somewhat amused.

No one in history has been born with 3 Quirks.The maximum was 2 or a fusion of 2 different ones with some particular relationship, but the boy had one that improved his physical abilities, another that gave him control of an element and a third with healing or resistance abilities.

The hero noticed that the boy was being transported to an ambulance so he quickly headed inside to accompany them.

A savage smile appeared.Perhaps fate made him wake up in a good mood today and feel charitable enough to help the useless blonde who tried harder to get attention and take pictures than to stop crimes, and then he found a diamond in the rough that could be the key to fulfilling his most desired wish.

"You better not die now kid,you've caught my attention".

After all, someone will have to pay the medical bill and the boy has definitely piqued his curiosity.He would be very disappointed if all this was just a waste of time

N/A:Well, this is the rewritten version of the prologue, if you read the first version, I hope you enjoyed this chapter better, Seeing the comparison with the original, I feel much more satisfied with the result. It better shows the wear and tear, not only physical but mental, of Tanjirou and the possible long-term consequences that this trauma will have on his subconscious if it is not treated properly.Furthermore, the participation of the other characters is much better and they are not just references or names that come and go,in addition to fixing some grammatical and vocabulary errors (I hate you autocorrect).If you just read it by first time, then ignore this,just read the rules of the story and discarded ideas, you really didn't miss anything, because the chapter has the same plot as the previous one, only now it is much better written (in my opinion)

To make some rules clear:

1)Breathings are real, I never liked that all breathings(except sun breathing) are just an illusion of the reader and if I write something about kimetsu, this rule is sacred to me.

2)Yoriichi didn't invent all the forms (keep this in mind for later).

3)Tanjirou didn't lose his arm or eye in the battle against Muzan, just so no one would mention anything about it.

4)Tanjirou will be a Hashira. I always thought it was unfair that he hadn't been named as such, when he was already treated as one more, but it never happened and in the last meeting of pillars he only thanks the surviving pillars and doesn't dedicate words to the rest, I expected at least a thank you to Tanjirou and the others but it never happened, again. In addition, Tomioka even praised Tanjirou's skills, putting him on the level of a pillar when he spent a while fighting 1 vs 1 against an Akaza who hated him and wanted him dead without hesitation. In my opinion, Tanjirou was on the level of obanai and should have received that honor to fight as Rengoku had predicted, as a hashira, whether of the sun or the flame.

5)Tanjirou's version is the version after the infinite castle, that is, the one at the end of the manga/anime (in case by any chance I didn't make it entirely clear). So keep in mind that his skill and power level will be far above several professional heroes, if we take into account his years of experience, entertainment as an assassin, the variety of techniques and breaths he knows how to use and the brand

6)Some of Tanjirou's abilities are not mastered yet (this doesn't mean that he will achieve a Quirk, no!!he will be a quikless, his development will be based on sun breathing and the mark).

7)Tanjirou will not fully follow the ideals of the heroes. Remember that despite Tanjiro's pure nature, he only wanted to kill Muzan to save his sister and has prioritized Nezuko's well-being on several occasions before saving lives, so do not expect so much that he has that heroic or compassionate personality like Izuku (a hero is not the same that a demon slayer) but he will want to help whoever needs it.

8)The tagged characters will not be the only protagonists, but there is no space, so I will only put those that will be from the beginning of the plot, but there will be more that will arrive over time.

-Discarded idea:

Uzui was also going to be in the battle against Muzan, being sent as reinforcement by Oyakata-sama, seeing that it was his greatest opportunity to finish off Muzan, but he would be decapitated, and his body would be used as food and shield by the demon king to partially recover the power of his regeneration. I didn't put it at the end because I think the introduction is already gore enough to add one more death to Tanjirou's shattered conscience (although one thing is the Kamado's perspective and another what really happened, I'll just say that...)

Thanks for reading :)